// CS201 HW10
// Problem 01

#include <iostream>
using namespace std;



#include <iostream>
using namespace std;

int power(int base, int exponent);

int main ()
{
    int base, exp;
    
    cout<<"Enter the base number, hit return, and enter the exponent:\n";
    cin>> base >> exp;
    cout<< "The answer is " <<power(base, exp) << endl;
    
    return 0;
}

int power(int base, int exponent)
{
    if(exponent > 0)
    {
        return base * power (base, exponent-1);
    }
    else
    {
        return 1;
    }
}


/*
Enter the base number, hit return, and enter the exponent:
2 5
The answer is 32
Press any key to continue
*/


Problem 2:

a) True
b) float *bar, foo;
   bar = &foo;
c)
  i)    d
  ii)   dy!
  iii)  75
d) 
  i) 6
  ii) a memory address


Problem 3:

//Doubles.h

#ifndef DOUBLES_H
#define DOUBLES_H

#include <iostream>

using std::ostream;
using std::istream;

class Doubles
{
 public: 

	friend ostream &operator<<(ostream &, const Doubles & );
    
	Doubles ( int=50);
	Doubles ( const Doubles &);
	~Doubles();
	Doubles &operator=(const Doubles &);
	double at(int);
	void change(int, double);

 private:
	double *ptr;
	int size;
};

#endif

//Doubles.cpp

#include "Doubles.h"
using namespace std;

Doubles::Doubles( int arraySize)
{
	size = arraySize;
	ptr = new double[size];
	for ( int i=0; i < size; i++)
		ptr[i]=0.0;
}

Doubles::Doubles(const Doubles & ds)
{
  size = ds.size;
  ptr = new double[ds.size];
  for ( int i= 0; i < size; i++ )
	  ptr[i] = ds.ptr[i];

}

Doubles & Doubles::operator =(const Doubles & ds )
{
	if(&ds != this ) { //check for self assignment
		if (size != ds.size) {
			 delete [] ptr;
			 size = ds.size;
			 ptr = new double[size];
		}
		for ( int i=0; i< size; i++)
			ptr[i] = ds.ptr[i];
	}
    
    return *this;
}


Doubles::~Doubles()
{
	delete [] ptr;
}

double Doubles::at(int n)
{
	return ptr[n];
}

void Doubles::change(int n, double d)
{
	ptr[n] = d;
}

ostream & operator<<(ostream & out, const Doubles & ds )
{
	for (int i=0; i < ds.size; i++)
		out << ds.ptr[i] <<' ';
	cout << endl;
	return out;
}


//driver.cpp


#include "Doubles.h"
using namespace std;

int main()
{

	Doubles ds1;
	cout << ds1;
    
	ds1.change(5, 101.0);
    cout << ds1;

	cout << ds1.at(5) << endl;
    
	Doubles ds2(ds1), ds3;
    cout << ds2 << endl;

	ds3 = ds2;
	cout << ds3;

	return 0;
}

/*
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 101 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0
101
0 0 0 0 0 101 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 101 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0
Press any key to continue

*/